dt-bindings: clock: Fix qcom,msm8996-apcc yaml syntax

Fix errors reported by dt_binding_check.
- Fix literal block scalar for dts example
- Fix schema identifier URI

Signed-off-by: Loic Poulain <loic.poulain@linaro.org>
Link: https://lore.kernel.org/r/1595326714-20485-1-git-send-email-loic.poulain@linaro.org


Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>